brightly colored original c. 1930's american depression era single-sided power substation polychrome enameled electrical wire and apparatus danger or cautionary sign. the heavy gauge die cut steel sign retains the original baked porcelain enameled finish with surface wear evident along the edges. very unique repeating lightning bolt pattern border. the mounting holes with steel grommets are intact. likely fabricated by the ready-made sign co., new york city, ny. measures 15 x 11 inches.